Wireless communication terminal and mobile type wireless communication terminal

ABSTRACT

A wireless communication terminal includes first and second case members coupled together by a coupling portion so that the positional relation therebetween can be changed, an external wireless communication antenna provided at the first case member, an external wireless communication control portion mainly controlling external wireless communication carried out through the external wireless communication antenna, a first internal wireless communication antenna, a first internal wireless communication control portion controlling internal wireless communication carried out through the first internal wireless communication antenna, a display part provided at the second case member, a second internal wireless communication antenna, a second internal wireless communication control portion controlling internal wireless communication carried out through the second internal wireless communication antenna, and an output power control portion controlling the output power of waves transmitted by the internal wireless communication based on the timing of transmitting waves transmitted through the external wireless communication antenna.

RELATED APPLICATIONS

This application claims priority to Japanese Patent Application No.2004-188349 filed Jun. 25, 2004 which is hereby expressly incorporatedby reference herein in its entirety.

BACKGROUND OF THE INVENTION

1. Technical Field

The present invention relates to a wireless type communication terminaland a mobile type wireless communication terminal, and is particularlyapplicable to a clamshell type mobile telephone and the like.

2. Related Art

In recent years, there have been attempts to increase the resolution ofliquid crystal displays in the mobile telephones so that still picturesor moving images taken by the digital cameras can be displayed withhigher definition in addition to normal still images such as charactersand graphics. This increases data quantities exchanged between a digitalcamera and a liquid crystal display and the use of LVDS (Low VoltageDifferential Signaling), a high speed transfer system for connectionwith a display part or an image sensing device has been proposed.

Recent mobile telephone handsets mostly employ the clamshell designbecause its foldable structure allows the mobile telephones to have alarger display size while their portability is not impaired and thedesign can prevent operation buttons from being accidentally pressedwhile the users carry the handsets around. The clamshell design has afirst case member including a control portion that mainly controls theexternal wireless communication function of the mobile telephone and asecond case member having a display part. The first and second casemembers are hinged together and can be opened and closed through thehinge.

However, as the resolution of the display part placed in the mobiletelephone increases, the number of pins in a flexible wiring board usedfor sending signals to the display part must be increased to transmithigh bit rate image data or the like to the display part through a wire.Therefore, in a mobile telephone handset with a clamshell design, theflexible wiring board with an increased number of pins must be passedthrough the hinge to allow the data transmission between the first andsecond case members through a wire, which complicates the hingestructure or the packaging process. This is not only an obstacle toreduce the size of the mobile telephone handset, but also pushes up thecost, and the reliability can be lowered.

Meanwhile, instead of the flexible wiring board, an internal wirelesscommunication antenna may be provided in each of the first and secondcase members, so that data transmission between the first and secondcase members can be carried out by internal wireless communication. Inthis case, the communication suffers from interference with wirelesscommunication outside the mobile telephone. Therefore, the environmentfor the internal wireless communication changes depending on thewireless communication outside the mobile telephone, and the reliabilityin surely transmitting data can be deteriorated.

When a wireless communication method operating with low limited outputby UWB (Ultra Wide Band) is employed for the internal wirelesscommunication in particular, the power level is greatly different fromthe waves output by the wireless communication outside the mobiletelephone, and the power level difference could be as large as 90 dB.

Therefore, the effect of even a signal outside the band of interest uponthe internal wireless communication could not be ignored, theinterference with the wireless communication outside the mobiletelephone degrades the wireless communication environment, the bit errorrate increases and retransmission caused by increase in the packet errorrate could be increased.

According to a method disclosed by Japanese Patent Publication No.2003-507954, a branch unit to branch a part of a transmission signal ina stage before the antenna is provided so that a very weak GPS signalcan be received while transmission is carried out by the mobilecommunication. A branch signal from the branch unit is attenuated orphase-shifted to produce an interference compensation signal, and theinterference compensation signal is superposed on the GPS signal.

According to the method disclosed by Japanese Patent Publication No.2003-507954, the branch unit, an attenuator, a phase shifter and asuperposing unit are necessary. A complicated and large-scale circuitconfiguration is necessary, and the cost, size, and weight areincreased.

SUMMARY

An advantage of the invention is to provide a wireless communicationterminal and a mobile wireless communication terminal that allow thecommunication environment to be changed by external wirelesscommunication and reduce the deterioration in the quality of theinternal wireless communication between first and second case members.

To attain the above-described advantage, a wireless communicationterminal according to one aspect of the invention includes a first casemember, a second case member coupled with the first case member, acoupling portion that couples the first and second case members so thatthe positional relation between the first and second case members can bechanged, an external wireless communication antenna provided at thefirst case member, an external wireless communication control portionthat mainly controls external wireless communication carried out throughthe external wireless communication antenna, a first internal wirelesscommunication antenna, a first internal wireless communication controlportion that controls internal wireless communication carried outthrough the first internal wireless communication antenna, a displaypart provided at the second case member, a second internal wirelesscommunication antenna, a second internal wireless communication controlportion that controls internal wireless communication carried outthrough the second internal wireless communication antenna, and anoutput power control portion that controls the output power of wavestransmitted by the internal wireless communication antennas based on thetiming of transmitting waves transmitted through the external wirelesscommunication antenna.

In this way, the transmission power of the internal wirelesscommunication carried out between the first and second case members canbe controlled depending on the power handled by the external wirelesscommunication. Therefore, while the effect of the internal wirelesscommunication upon the quality of the external wireless communication isreduced, the internal wireless communication can be carried out. If theeffect of interference by the external wireless communication is great,the deterioration in the quality of the internal wireless communicationcan be reduced. Therefore, the communication quality both in theexternal and internal wireless communication can be secured, while datatransmission between the first and second case members can be carriedout wirelessly. Consequently, even if the data transmission quantitybetween the first and second case members increases, the positionalrelation between the first and second case members can be changedwithout complicating the structure of the coupling portion. Therefore,the size of the wireless communication terminal can be reduced and thereliability can be improved while an increase in cost is kept low. Inaddition, the wireless communication terminal may have a larger screenand can carry out an increased number of functions while the portabilityof the wireless communication terminal is not impaired.

A wireless communication terminal according to another aspect of theinvention includes a first case member, a second case member, a couplingportion that couples the first and second case members so that thepositional relation between the first and second case members can bechanged, an external wireless communication antenna provided at thefirst case member, an external wireless communication control portionthat mainly controls external wireless communication carried out throughthe external wireless communication antenna, a first internal wirelesscommunication antenna, a first internal wireless communication controlportion that controls internal wireless communication carried outthrough the first internal wireless communication antenna, a displaypart provided at the second case member, a second internal wirelesscommunication antenna, a second internal wireless communication controlportion that controls internal wireless communication carried outthrough the second internal wireless communication antenna, a carrierdetecting portion that detects the output level of waves transmittedfrom the external wireless communication antenna, and an output powercontrol portion that controls the output power of waves transmitted fromat least one of the first and second internal wireless communicationantennas based on the output level detected by the carrier detectingportion.

In this way, the output level of waves transmitted through the externalwireless communication antenna can be directly monitored, and it can bedetermined whether or not the waves are transmitted through the externalwireless communication antenna. Therefore, according to the transmissiontiming for external wireless communication, the transmission power ofthe internal wireless communication can be controlled, and the cost canbe prevented from increasing, the size of the wireless communicationterminal can be reduced, and the reliability of the terminal can beimproved. Meanwhile, the screen size at the wireless communicationterminal can be increased and the number of functions carried out by theterminal can be increased while the portability of the terminal is notimpaired.

According to another aspect of the invention, the output power controlportion sets the transmission power of the internal wirelesscommunication carried out at the time of transmission by the externalwireless communication to be larger than the transmission power of theinternal wireless communication carried out at the receiving time by theexternal wireless communication.

In this way, when the power handled by the external wirelesscommunication is large, the transmission power of the internal wirelesscommunication can be increased. At the receiving time by the externalwireless communication, the transmission power of the internal wirelesscommunication can be reduced. Therefore, while the deterioration in thequality of the internal wireless communication can be reduced, thetransmission operation by the external wireless communication can becarried out. In addition, the internal wireless communication can becarried out without affecting the receiving operation by the externalwireless communication.

A wireless communication terminal according to yet another aspect of theinvention includes a first case member, a second case member, a couplingportion that couples the first and second case members so that thepositional relation between the first and second case members can bechanged, an external wireless communication antenna provided at thefirst case member, an external wireless communication control portionthat mainly controls external wireless communication carried out throughthe external wireless communication antenna, a first internal wirelesscommunication antenna, a first internal wireless communication controlportion that controls internal wireless communication carried outthrough the first internal wireless communication antenna, a displaypart provided at the second case member, a second internal wirelesscommunication antenna, a second internal wireless communication controlportion that controls internal wireless communication carried outthrough the second internal wireless communication antenna, acommunication environment detecting portion that detects a communicationenvironment based on a signal received through the external wirelesscommunication antenna, a first output power control portion thatcontrols the output power of waves transmitted from the externalwireless communication antenna based on the communication environmentdetected by the communication environment detecting portion, and asecond output power control portion that controls the output power ofwaves transmitted from at least one of the first and second internalwireless communication antennas based on the result of the control bythe first output power control portion.

In this way, the transmission power of the external wirelesscommunication can be controlled based on the communication environment,while the transmission power of the internal wireless communication canbe increased based on the transmission power of the external wirelesscommunication. In this way, the deterioration in the quality of theinternal wireless communication can be reduced while the quality of theexternal wireless communication can be improved.

According to yet another aspect of the invention, the wirelesscommunication terminal is a mobile telephone.

Therefore, when a clamshell design is employed for the mobile telephone,the data transmission between the case members of the mobile telephonecan be wirelessly and stably carried out. In this way, even if thequantity of data exchanged between the first and second case membersincreases to cope with a display part with higher resolution provided inthe mobile telephone, the structure of the coupling portion and thepackaging process can be prevented from being complicated. Consequently,the size of the wireless communication terminal can be reduced and thereliability of the terminal can be improved while an increase in cost iskept low. In addition, the size of the screen of the mobile telephoneand the number of functions carried out by the telephone can beincreased while the portability of the telephone is not impaired.

According to a still further aspect of the invention, the internalwireless communication is very weak radio or close range radio by UWBradio.

In this way, while the output level of the internal wirelesscommunication is reduced, the internal wireless communication can becarried out stably. Therefore, if the quantity of data transmissionbetween the first and second case members increases, the datatransmission between them can be carried out wirelessly within legalrestrictions, and therefore the positional relation between the firstand second case members can be changed without complicating thestructure of the coupling portion.

In a mobile type wireless communication terminal according to a stillfurther aspect of the invention, two case members are coupled so thatthe relative position between the two case members can be changed. Theterminal includes an internal wireless communication portion thattransmits/receives data between the two case members, and an externalwireless communication portion that wirelessly communicates with anexternal device in at least one of the two case members. Thetransmission power of the internal wireless communication carried out atthe transmitting time by the external wireless communication is largerthan the transmission power of the internal wireless communicationcarried out at the receiving time by the external wirelesscommunication.

In this way, the adverse effect of interference between the internal andexternal wireless communication can be reduced. Consequently, thedeterioration in the quality of the internal wireless communicationbetween the case members can be reduced while allowing the communicationenvironment to be changed according to the external wirelesscommunication, and the increase in the quantity of data transmissionbetween the case members can be realized while the flexibility in thepositional relation between the case members is secured.

BRIEF DESCRIPTION OF THE DRAWINGS

The invention will be described with reference to the accompanyingdrawings, wherein like numbers reference like elements, and wherein:

FIG. 1 is a perspective view showing the state of a clamshell typemobile telephone handset to which a method of controlling wirelesscommunication according to the invention is applied as the handset isopen;

FIG. 2 is a perspective view showing the state of the clamshell typemobile telephone handset to which the method of controlling wirelesscommunication according to the invention is applied as the handset isclosed;

FIG. 3 is a perspective overview of a rotating type mobile telephonehandset to which the method of controlling wireless communicationaccording to the invention is applied;

FIG. 4 is a schematic block diagram of the configuration of a wirelesscommunication terminal according to a first embodiment of the invention;

FIG. 5 is a schematic block diagram of the configuration of a radiofrequency processing portion and a carrier detecting portion in FIG. 4;

FIGS. 6A through 6C are timing charts for use in illustration of amethod of controlling the internal communication in the wirelesscommunication terminal in FIG. 4;

FIG. 7 includes graphs for use in illustrating how to set transmissionpower according to an embodiment of the invention;

FIG. 8 is a schematic block diagram of the configuration of a wirelesscommunication terminal according to a second embodiment of theinvention;

FIG. 9 is a schematic block diagram of the configuration of a wirelesscommunication terminal according to a third embodiment of the invention;and

FIG. 10 is a block diagram of the configuration of a wirelesscommunication terminal according to a fourth embodiment of theinvention.

DESCRIPTION OF EMBODIMENTS

Now, a wireless communication terminal and a method of controllingwireless communication according to embodiments of the invention will bedescribed with reference to the drawings.

FIG. 1 is a perspective view showing the state of a clamshell typemobile telephone to which a method of controlling wireless communicationaccording to the invention is applied as the handset is opened. FIG. 2is a perspective view showing the state of the clamshell type mobiletelephone as the handset is closed.

In FIGS. 1 and 2, operation buttons 4 are provided at the surface of afirst case member 1, a microphone 5 is provided at the lower end of thefirst case member 1, and an external wireless communication antenna 6 isprovided on the upper end of the first case member 1. A display part 8is provided at the surface of a second case member 2 and a speaker 9 isprovided at the upper end of the second case member 2. There are adisplay part 11 and an image-sensing device 12 at the back surface ofthe second case member 2. Note that as the display parts 8 and 11, forexample a liquid crystal panel, an organic EL panel, a plasma displaypanel or the like may be employed. As the image sensing device 12, a CCDor a CMOS sensor may be used. The first and second case members 1 and 2are provided with internal wireless communication antennas 7 and 10,respectively for internal wireless communication between these members.

The first and second case members 1 and 2 are coupled through a hinge 3,and the second case member 2 can be folded onto the first case member 1as the former is pivoted around the hinge 3. When the second case member2 is closed onto the first case member 1, the operation buttons 4 can beprotected by the second case member 2, and the buttons 4 can beprevented from being accidentally operated as the user carries themobile telephone around. As the second case member 2 is unfolded fromthe first case member 1, the user can operate the operation buttons 4while looking at the display part 8 or speaking on the other end usingthe speaker 9 and the microphone 5, or carry out image-sensing whileoperating the operation buttons 4.

In this way, the use of the clamshell design allows the display part 8to be provided almost entirely over one surface of the second casemember 2, and therefore the size and the visibility of the display part8 can be increased without impairing the portability of the mobiletelephone.

With the internal wireless communication antennas 7 and 10 provided inthe first and second case members 1 and 2, respectively, datatransmission between the first and second case members 1 and 2 can becarried out by internal wireless communication. For example, image dataor audio data obtained into the first case member 1 through the externalwireless communication antenna 6 may be transmitted to the second casemember 2 by internal wireless communication using the internal wirelesscommunication antennas 7 and 10, so that images may be displayed at thedisplay part 8, or audio sounds can be output from the speaker 9.Photographic data taken by the image-sensing device 12 may betransmitted from the second case member 2 to the first case member 1 byinternal wireless communication using the internal wirelesscommunication antennas 7 and 10 and externally output through theexternal wireless communication antenna 6.

In this way, the use of wired data transmission between the first andsecond case members 1 and 2 is no longer necessary, and a flexiblewiring board with a large number of pins does not have to be passedthrough hinge 3. Therefore, the structure of the hinge 3 and thepackaging process can be prevented from being complicated. This allowsthe size of the mobile telephone to be reduced and the reliability to beimproved while the cost increase is kept low. In addition, the mobiletelephone may have a larger screen and an increased number of functionswithout impairing its portability.

FIG. 3 is a perspective overview of a rotating type mobile telephone towhich the method of controlling wireless communication according to theinvention is applied.

In FIG. 3, operation buttons 24 are provided at a surface of a firstcase member 21, a microphone 25 is provided at the lower end of thefirst case member 21, and an external wireless communication antenna 26is attached at the upper end of the first case member 21. A display part28 is provided at the surface of the second case member 22, and aspeaker 29 is provided at the upper end of the second case member 22.The first and second case members 21 and 22 are provided with internalwireless communication antennas 27 and 30 between them.

The first and second case members 21 and 22 are coupled through a hinge23. When the second case member 22 is turned horizontally around thehinge 23, the second case member 22 may be placed on the first casemember 21 or may be shifted from the first case member 21. When thesecond case member 22 is placed on the first case member 21, theoperation buttons 24 can be protected by the second case member 22, sothat the operation buttons 24 can be prevented from being accidentallyoperated while the user carries the mobile telephone around. As thesecond case member 22 is turned horizontally to shift from the firstcase member 21, the user can operate the operation buttons 24 whilelooking at the display part 28 or speaking on the other end using thespeaker 29 and the microphone 25.

In this way, with the internal wireless communication antennas 27 and 30provided in the first and second case members 21 and 22, respectivelydata transmission between the first and second case members 21 and 22can be carried out by internal wireless communication. For example,image data or audio data obtained into the first case member 21 throughthe external wireless communication antenna 26 may be transmitted to thesecond case member 22 by internal wireless communication by the internalwireless communication antennas 27 and 30, and images can be displayedat the display part 28 or audio sounds may be output from the speaker29.

In this way, a flexible wiring board with a large number of pins doesnot have to be passed through hinge 23. Therefore, the structure of thehinge 23 can be prevented from being complicated, and the packagingprocess can be prevented from being complicated. This allows the size ofthe mobile telephone to be reduced and the reliability to be improvedwhile keeping the cost low. In addition, the mobile telephone may have alarger screen and an increased number of functions without impairing itsportability.

Note that according to the above described embodiment, the mobiletelephone has been described by way of illustration, but the inventionmay be applied to a PDA (Personal Digital Assistant), a notebook typepersonal computer, and the like.

FIG. 4 is a schematic block diagram of a wireless communication terminalaccording to a first embodiment of the invention.

In FIG. 4, a first case member K11 includes an external wirelesscommunication antenna 101 that transmits/receives waves for externalwireless communication, a radio frequency processing portion 102 thatmodulates/demodulates a signal transmitted/received through the externalwireless communication antenna 101, a base band signal processingportion 103 that carries out base band signal processing, a controlportion 104 that controls the wireless communication terminal as awhole, a RAM 105 that provides the control portion 104 with a work areafor carrying out processing and storing the result of processing, a ROM106 that stores various control programs used to operate the wirelesscommunication terminal, a transmitting/receiving portion 107 thatcontrols the internal wireless communication carried out through theinternal wireless communication antenna 108, an internal wirelesscommunication antenna 108 that transmits/receives waves for internalwireless communication on the side of the first case member K11, acarrier detecting portion 109 that detects the output level of a radiofrequency processing portion 102, and an electric power control portion110 that instructs the transmitting/receiving portion 107 to control theoutput power of the waves transmitted through the internal wirelesscommunication antenna 108.

Note that when the output power of the waves transmitted through theinternal wireless communication antenna 108 is controlled, thetransmission power of the internal wireless communication carried out atthe time of transmission by external wireless communication can be setlarger than the transmission power of internal wireless communicationcarried out at the receiving time by external wireless communication.

The second case member K12 includes a transmitting/receiving portion 121that controls internal wireless communication carried out through aninternal wireless communication antenna 122, the internal wirelesscommunication antenna 122 that transmits/receives waves for internalwireless communication on the side of the second case member K12, acamera 123 that carries out image-sensing, a liquid crystal display 124that indicates display data, and an additional device 125. Note that thedata transmitted/received by external wireless communication is forexample audio data during telephone communication, character data andimage data during e-mailing, and the like. The data transmitted/receivedby internal wireless communication is photographic data taken by thecamera 123, display data to be displayed on the liquid crystal display124 or a control signal used to control the second case member K12. Thecontrol portion 104 may be a CPU. The additional device 125 for examplemay be an LED, a microphone, or a speaker.

The first and second case members K11 and K12 are coupled so that theirpositional relation can be changed. Note that the positional relationbetween the first and second case members K11 and K12 may be changed byfolding the second case member K12 onto the first case member K11, byhorizontally turning the second case member K12 on the first case memberK11, or by sliding the second case member K12 on the first case memberK11 from side to side or backward/forward.

When data is transmitted through the external wireless communicationantenna 101, the transmission data transmitted to the base band signalprocessing portion 103 is subjected to base-band signal processing. Thetransmission data output from the base band signal processing portion103 is modulated by the radio frequency processing portion 102, and theresulting data is externally transmitted through the external wirelesscommunication antenna 101. Meanwhile, when data is received through theexternal wireless communication antenna 101, the data received throughthe external wireless communication antenna 101 is sent to the radiofrequency processing portion 102, where the data is demodulated. Thereception data output from the radio frequency processing portion 102 issent to the base band signal processing portion 103 and subjected tobase band signal processing, and the resulting data is then output tothe control portion 104.

In this case, a signal transmitted/received from/at the radio frequencyprocessing portion 102 is sent to the carrier detecting portion 109,where the input/output level of the radio frequency processing portion102 is detected. The power control portion 110 then determines whetherthe transmission or the reception is carried out by the externalwireless communication based on the input/output level of the radiofrequency processing portion 102.

FIG. 5 is a schematic block diagram of the radio frequency processingportion 102 and the carrier detecting portion 109 in FIG. 4.

In FIG. 5, the radio frequency processing portion 102 includes a switch144, a low-noise amplifier 145, a power amplifier 132, mixers 146, 127,133, and 137, filters 147, 128, 134, and 138, A/D converters 148, 129,D/A converters 135, 139, phase shifters 126 and 136, an adder 140, and aPLL circuit 141. The carrier detecting portion 109 is provided to detectthe output level at the time of transmission. The carrier detectingportion 109 includes a power detector 142 and a comparator 143.

At the receiving time, the switch 144 is switched to the side of thelow-noise amplifier 145. A signal received through the external wirelesscommunication antenna 101 is sent to the mixers 146 and 127 through thelow-noise amplifier 145. A local oscillation signal produced by the PLLcircuit 141 is input to the mixer 146 through the phase shifter 126 anda local oscillation signal generated by the PLL circuit 141 is directlyinput to the mixer 127.

The signal output from the low-noise amplifier 145 is mixed with thephase-shifted local oscillation signal at the mixer 146, and then has adesired frequency component extracted by the filter 147. The signal thenoutput from the filter 147 is digitized by an A/D converter 148, andthen sent to the base band signal processing portion 103. The signaloutput from the low-noise amplifier 145 is mixed with the localoscillation signal at the mixer 127, and then has a desired frequencycomponent extracted by the filter 128. The signal output from the filter128 is digitized by the A/D converter 129, and then sent to the baseband signal processing portion 103.

Meanwhile, at the time of transmission, the switch 144 is switched tothe side of power amplifier 132. Signals output from the base bandsignal processing portion 103 are converted into analog signals by D/Aconverters 135 and 139 and then have desired frequency componentsextracted by filters 134 and 138. The signals output from the filters134 and 138 are transmitted to the mixers 133 and 137, respectively. Alocal oscillation signal generated by the PLL circuit 141 is input tothe mixer 133 through the phase shifter 136, and a local oscillationsignal generated by the PLL circuit 141 is directly input to the mixer137. The signal output from the filter 134 is mixed with thephase-shifted local oscillation signal at the mixer 133 and thentransferred to the adder 140. The signal output from the filter 138 ismixed with the local oscillation signal at the mixer 137 and thentransmitted to the adder 140. After the signals output from the mixers133 and 137 are added at the adder 140 and then transmitted to theexternal wireless communication antenna 101 through the power amplifier122 and externally output through the external wireless communicationantenna 101.

The signal output from the power amplifier 132 is transmitted to thepower director 142, where the transmission output level is detected. Theoutput level detected by the power detector 142 is compared to areference value at the comparator 143, and the result of the comparisonis sent to the power control portion 110 in FIG. 4.

The power control portion 110 determines whether the transmission or thereception is carried out by the external wireless communication based onthe output level detected by the carrier detecting portion 109 once theoutput level at the time of external wireless communication is detectedby the carrier detecting portion 109. If the transmission is carried outby the external wireless communication, the power control portion 110can instruct the transmitting/receiving portion 107 to raise thetransmission power of the internal wireless communication, and if thereception is carried out by the external wireless communication, thecontrol portion can instruct the transmitting/receiving portion 107 tolower the transmission power of the internal wireless communication.Note that when neither transmission nor reception is carried out by theexternal wireless communication, the power control portion 110 can issuean instruction so that the transmission power of the internal wirelesscommunication is equal to or lower than the transmission power of theinternal wireless communication when the reception is carried out by theexternal wireless communication.

In this case, as the communication method in the external wirelesscommunication at the wireless communication terminal, TDMA (TimeDivision Multiple Access), a multiple access method may be employed. ByTDMA, one frequency band is segmented by prescribed time intervals, anda plurality of users can share one frequency band each for a prescribedperiod. More specifically, the frequency band is divided by timeintervals, and allocated to the wireless communication terminal, and forthe allocated time period, the entire band width can be used. Thewireless communication terminals can continuously and periodicallytransmit signals.

FIGS. 6A through 6C are timing charts for use in illustration of amethod of controlling internal communication at the wirelesscommunication terminal in FIG. 4.

In FIG. 6A, if for example slot 1 among slots 1 through 4 represents thetransmission timing allocated to the user wireless communicationterminal, in the other slots 2 through 4, data is not transmitted fromthe user wireless communication terminal to the base station. Therefore,the carrier detecting portion 109 in FIG. 4 can monitor the input/outputlevel of the radio frequency processing portion 102 and detect thetransmission timing allocated to the user wireless communicationterminal. As shown in FIG. 6B, the power control portion 110 cangenerate a transmission timing signal S11 based on the output leveldetected by the carrier detecting portion 106 and output thetransmission timing signal S11 to the transmitting/receiving portion107. Upon receiving the transmission timing signal S11 from the powercontrol portion 110, the transmitting/receiving portion 107 can transmitimage data or audio data transmitted from the control portion 104 whilethe output power of the waves output from the internal wirelesscommunication antenna 108 is raised as shown in FIG. 6C. The image dataor audio data transmitted through the internal wireless communicationantenna 108 is received through the internal wireless communicationantenna 122. The transmitting/receiving portion 121 can make the liquidcrystal display part 124 display the image data received through theinternal wireless communication antenna 122 or the speaker output theaudio data received through the internal wireless communication antenna122.

FIG. 7 includes graphs for use in illustrating how to set thetransmission power of the internal wireless communication according toan embodiment of the invention.

In FIG. 7, the power transmitted through the internal wirelesscommunication antenna 108 at the receiving time by the external wirelesscommunication is set to −60 dBm so that the power does not interferewith the reception by the external wireless communication. Meanwhile,the power transmitted through the external wireless communicationantenna 101 is +30 dBm. If the interference by the external wirelesscommunication can be attenuated by 70 dB by the filtering characteristicF and the interference by the external wireless communication can beattenuated by 10 dB by shielding, the power transmitted through theinternal wireless communication antenna 108 at the time of transmissionby the external wireless communication is increased by 20 dB, so thatthe interference by the external wireless communication can be reducedwhile the internal wireless communication can be carried out stably withthe margin of 10 dB.

At the receiving time by the external wireless communication, the powertransmitted through the internal wireless communication antenna 108 isreturned to the original −60 dBm, so that the effect of the internalwireless communication upon the receiving operation by the externalwireless communication can be reduced. In this case, at the receivingtime by the external wireless communication, the effect of the waves bythe external wireless communication is smaller than at the time oftransmission by the external wireless communication, and therefore thecommunication quality by the internal wireless communication can besecured even if the output power by the internal wireless communicationis small.

Note that a mobile telephone is a specific example of a wirelesscommunication terminal. Therefore, when the clamshell design is employedfor a mobile telephone, data transmission between the first and secondcase members K11 and K12 can be stably wirelessly carried out. As aresult, if the quantity of data exchanged between the first and secondcase members K11 and K12 increases as the resolution of the liquidcrystal display part 124 and the screen size increase in the mobiletelephone, the increase in the number of interconnections between thefirst and second case members K11 and K12 can be reduced. This preventsthe hinge structure and the packaging process from being complicated.

As the internal wireless communication using the internal wirelesscommunication antennas 7 and 10, very weak radio or close range radio byUWB radio may be employed. In this way, the internal wirelesscommunication can be carried out stably while the output level of theinternal wireless communication can be reduced. Therefore, if the datatransmission quantity between the first and second case members K11 andK12 increases, the data transmission between them can be carried outwirelessly within the legal restrictions, and therefore the increase inthe number of interconnections between the first and second case membersK11 and K12 can be reduced.

The embodiment shown in FIG. 4 is related to how the power controlportion 110 outputs the transmission timing signal S11 to thetransmitting/receiving portion 107, while the transmission timing signalmay be output to both the transmitting/receiving portions 107 and 121.The transmitting/receiving portion 121 may raise the transmission powerby the internal wireless communication carried out through the internalwireless communication antenna 122 at the time of transmission by theexternal wireless communication.

According to the above-described embodiment, TDMA has been described asthe method for external wireless communication by way of illustration,but a multiple access method such as FDMA (Frequency Division MultipleAccess) and CDMA (Code Division Multiple Access) may be applied otherthan TDMA.

FIG. 8 is a schematic block diagram of the configuration of a wirelesscommunication terminal according to a second embodiment of theinvention.

In FIG. 8, a first case member K31 includes an external wirelesscommunication antenna 301, a radio frequency processing portion 302, abase band signal processing portion 303, a control portion 304, a RAM305, a ROM 306, a transmitting/receiving portion 307, an internalwireless communication antenna 308, a carrier detecting portion 309, anpower control portion 310, and a carrier detecting antenna 311. A secondcase member K32 includes a transmitting/receiving portion 321, aninternal wireless communication antenna 322, a camera 323, a liquidcrystal display part 324, and an additional device 325. The first andsecond case members K31 and 32 are hinged together so that theirpositional relation can be changed.

Waves transmitted through the external wireless communication antenna301 are received by the carrier detecting antenna 311, and the carrierdetection signal is transmitted to the carrier detecting portion 309.Upon receiving the carrier detection signal received by the carrierdetecting antenna 311, the carrier detecting portion 309 detects theoutput level of the carrier detection signal and outputs thedetermination result to the power control portion 310.

The power control portion 310 generates a transmission timing signal S31based on the output level detected by the carrier detecting portion 309and outputs the transmission timing signal S31 to thetransmitting/receiving portion 307. Upon receiving the transmissiontiming signal S31 from the power control portion 310, thetransmitting/receiving portion 307 can carry out internal wirelesscommunication between the first and second case members K31 and K32while the output power of the waves output from the internal wirelesscommunication antenna 308 is raised.

In this way, the output level of the waves transmitted through theexternal wireless communication antenna 301 can be directly monitoredand it can be determined whether or not the waves are transmittedthrough the external wireless communication antenna 301. Therefore,according to the transmission timing for external wirelesscommunication, the transmission power of the internal wirelesscommunication can be controlled, and therefore the cost can be preventedfrom increasing, the size of the wireless communication terminal can bereduced, and the reliability of the terminal can be improved. Meanwhile,the size of the screen at the wireless communication terminal can beincreased and the number of functions carried out by the terminal can beincreased while the portability of the terminal is not impaired.

FIG. 9 is a schematic block diagram of the configuration of a wirelesscommunication terminal according to a third embodiment of the invention.

In FIG. 9, A first case member K41 includes an external wirelesscommunication antenna 401, a radio frequency processing portion 402, abase band signal processing portion 403, a control portion 404, a RAM405, a ROM 406, a transmitting/receiving portion 407, an internalwireless communication antenna 408, and a power control portion 410. Asecond case member K42 includes a transmitting/receiving portion 421, aninternal wireless communication antenna 422, a camera 423, a liquidcrystal display part 424, and an additional device 425. The first andsecond case members K41 and K42 are coupled so that their positionalrelation can be changed.

When data is transmitted through the external wireless communicationantenna 401, the control portion 404 transmits transmission data to thebase band signal processing portion 403 and notifies the power controlportion 410 of the transmission timing at the time of transmitting thedata. The base band signal processing portion 403 carries out base bandsignal processing to the transmission data from the control portion 404and outputs the resulting data to the radio frequency processing portion402. Upon receiving the transmission data after the base band signalprocessing, the radio frequency processing portion 402 modulates thereceived data and externally output the resulting signal through theexternal wireless communication antenna 401.

When the power control portion 410 is notified of the transmittingtiming for the transmission data from the control portion 404, the powercontrol portion 410 generates a transmission timing signal S41 andoutputs the generated signal S41 to the transmitting/receiving portion407. Upon receiving the transmission timing signal S41 from the powercontrol portion 410, the transmitting/receiving portion 407 can carryout internal wireless communication between the first and second casemembers K41 and K42 while the output power of the waves output from theinternal wireless communication antenna 408 is raised.

In this way, it can be determined whether or not waves are transmittedthrough the external wireless communication antenna 401 in response tothe transmission timing information received from the control portion404. Therefore, the transmission power of the internal wirelesscommunication can be controlled in response to the transmission timingfor external wireless communication. In this way, the size of thewireless communication terminal can be reduced and the reliability canbe improved while an increase in cost is kept low. In addition, thescreen size of the wireless communication terminal and the number offunctions can be increased without impairing the portability of thewireless communication terminal.

Note that in the wireless communication terminal, the communicationprotocol with the outside may be determined in advance based on theoperation mode such as waiting, speaking, and packet telecommunication.Therefore, the control portion 404 can obtain the transmission/receptiontiming in advance when for example TDMA or packet communication iscarried out. Therefore, the power control portion 410 may control theoutput power of waves output from the internal wireless communicationantenna 408 based on the time schedule determined according to thetransmission/reception timings for external wireless communication.

FIG. 10 is a block diagram of the configuration of a wirelesscommunication terminal according to a fourth embodiment of theinvention.

In FIG. 10, a first case member K51 includes an external wirelesscommunication antenna 501, a radio frequency processing portion 502, abase band signal processing portion 503, a control portion 504, a RAM505, a ROM 506, a transmitting/receiving portion 507, an internalwireless communication antenna 508, a communication environmentdetecting portion 509, and power control portions 510 and 511. A secondcase member K52 includes a transmitting/receiving portion 521, aninternal wireless communication antenna 522, a camera 523, a liquidcrystal display part 524, and an additional device 525. The first andsecond case members K51 and K52 are coupled so that their positionalrelation can be changed.

In this case, the communication environment detecting portion 509detects a communication environment based on a reception signal receivedthrough the external wireless communication antenna 501. Note that thecommunication environment may be detected based on the bit error ratefor digital signals, and based on the signal-to-noise ratio ordistortion factor for analog signals. The power control portion 511controls the output power of waves transmitted from the externalwireless communication antenna 501 based on the communicationenvironment detected by the communication environment detecting portion509. The power control portion 510 controls the output power of wavestransmitted from the internal wireless communication antenna 508 basedon the control result by the power control portion 511.

When data is transmitted through the external wireless communicationantenna 501, the control portion 504 notifies the power control portion510 of the transmission timing for transmitting the transmission data.When the power control portion 510 is notified of the transmissiontiming for the transmission data from the control portion 504, the powercontrol portion 510 generates a transmission timing signal S51, andoutputs the generated signal S51 to the transmitting/receiving portion507. Upon receiving the transmission timing signal S51 from the powercontrol portion 510, the transmitting/receiving portion 507 carries outinternal wireless communication between the first and second casemembers K51 and K52 while the output power of the waves output from theinternal wireless communication antenna 408 is raised.

Meanwhile, when the communication environment is detected at thecommunication environment detecting portion 509, the detection result issent to the power control portion 511. When the communicationenvironment is degraded, the power control portion 511 instructs theradio frequency processing portion 502 to raise the output power of thewaves output from the external wireless communication antenna 501. Uponreceiving the instruction to raise the output power from the powercontrol portion 511, the radio frequency processing portion 502 raisesthe output power of waves output from the external wirelesscommunication antenna 501.

When the output power of waves output from the external wirelesscommunication antenna 501 is raised, the power control portion 511instructs the power control portion 510 to raise the output power ofwaves output from the internal wireless communication antenna 508. Uponreceiving the instruction to raise the output power from the powercontrol portion 511, the power control portion 510 instructs thetransmitting/receiving portion 507 to raise the output power of wavesoutput from the external wireless communication antenna 508.

Upon receiving the instruction to raise the output power from the powercontrol portion 510, the transmitting/receiving portion 507 can raisethe output power of waves output from the internal wirelesscommunication antenna 508 by an amount corresponding to the increase inthe output power of waves output from the external wirelesscommunication antenna 501.

In this way, the transmission power of the external wirelesscommunication can be controlled based on the communication environment,and the transmission power of the internal wireless communication can beincreased based on the transmission power of the external wirelesscommunication. Therefore, the quality of the internal wirelesscommunication can be kept less degraded while the quality of theexternal wireless communication can be improved.

1. A wireless communication terminal, comprising: a first case member; asecond case member coupled with the first case member; a couplingportion that couples the first and second case members so that apositional relation between the first and second case members can bechanged; an external wireless communication antenna provided at thefirst case member; an external wireless communication control portionthat controls external wireless communication carried out through theexternal wireless communication antenna; a first internal wirelesscommunication antenna; a first internal wireless communication controlportion that controls internal wireless communication carried outthrough the first internal wireless communication antenna; a displaypart provided at the second case member; a second internal wirelesscommunication antenna; a second internal wireless communication controlportion that controls internal wireless communication carried outthrough the second internal wireless communication antenna; and anoutput power control portion that controls output power of wavestransmitted by the internal wireless communication based on a timing oftransmitting waves transmitted through the external wirelesscommunication antenna, wherein the output power control portion setstransmission power of the internal wireless communication carried out ata time of transmission by the external wireless communication to belarger than the transmission power of the internal wirelesscommunication carried out at a receiving time by the external wirelesscommunication.
 2. The wireless communication terminal according to claim1, wherein: the wireless communication terminal comprises a mobiletelephone.
 3. The wireless communication terminal according to claim 1,wherein: the internal wireless communication comprises one of a veryweak radio and a close range radio by UWB radio.
 4. A wirelesscommunication terminal, comprising: a first case member; a second casemember; a coupling portion that couples the first and second casemembers so that a positional relation between the first and second casemembers can be changed; an external wireless communication antennaprovided at the first case member; an external wireless communicationcontrol portion that controls external wireless communication carriedout through the external wireless communication antenna; a firstinternal wireless communication antenna; a first internal wirelesscommunication control portion that controls internal wirelesscommunication carried out through the first internal wirelesscommunication antenna; a display part provided at the second casemember; a second internal wireless communication antenna; a secondinternal wireless communication control portion that controls internalwireless communication carried out through the second internal wirelesscommunication antenna; a carrier detecting portion that detects anoutput level of waves transmitted from the external wirelesscommunication antenna; and an output control portion that controlsoutput power of waves transmitted from at least one of the first andsecond internal wireless communication antennas based on the outputlevel detected by the carrier detecting portion, wherein the outputpower control portion sets transmission power of the internal wirelesscommunication carried out at a time of transmission by the externalwireless communication to be larger than the transmission power of theinternal wireless communication carried out at a receiving time by theexternal wireless communication.
 5. The wireless communication terminalaccording to claim 4, wherein: the wireless communication terminalcomprises a mobile telephone.
 6. The wireless communication terminalaccording to claim 4, wherein: the internal wireless communication isone of a very weak radio and a close range radio by UWB radio.
 7. Awireless communication terminal, comprising: a first case member; asecond case member; a coupling portion that couples the first and secondcase members so that a positional relation between the first and secondcase members can be changed; an external wireless communication antennaprovided at the first case member; an external wireless communicationcontrol portion that controls external wireless communication carriedout through the external wireless communication antenna; a firstinternal wireless communication antenna; a first internal wirelesscommunication control portion that controls internal wirelesscommunication carried out through the first internal wirelesscommunication antenna; a display part provided at the second casemember; a second internal wireless communication antenna; a secondinternal wireless communication control portion that controls internalwireless communication carried out through the second internal wirelesscommunication antenna; a communication environment detecting portionthat detects a communication environment based on a signal receivedthrough the external wireless communication antenna; a first outputpower control portion that controls output power of waves transmittedfrom the external wireless communication antenna based on thecommunication environment detected by the communication environmentdetecting portion; and a second output power control portion thatcontrols output power of waves transmitted from at least one of thefirst and second internal wireless communication antennas based on aresult of control by the first output power control portion.
 8. Thewireless communication terminal according to claim 7, wherein: thewireless communication terminal comprises a mobile telephone.
 9. Thewireless communication terminal according to claim 7, wherein: theinternal wireless communication is one of a very weak radio and a closerange radio by UWB radio.
 10. A mobile type wireless communicationterminal having two case members coupled so that their relative positioncan be changed, the terminal comprising: an internal wirelesscommunication portion that transmits/receives data between the two casemembers; and an external wireless communication portion that wirelesslycommunicates with an external device in at least one of the two casemembers, a transmission power of the internal wireless communicationcarried out at a time of transmission by the external wirelesscommunication portion to be larger than a transmission power of theinternal wireless communication portion carried out at a receiving timeby the external wireless communication portion.